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By Mark J. Johnson

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Designed for a CS2 facts constructions direction, this article offers an intensive yet concise assessment of knowledge buildings in addition to a steady creation to Java. It makes use of a concise kind and comprises pseudocode and workouts all through in order that scholars easy methods to write code, instead of simply learn it. The publication covers all the major components taught in CS2 classes, together with arrays, lists, stacks, queues, recursion, maps, and trees. Read more...

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Designed for a CS2 info constructions direction, this article presents an intensive yet concise review of information constructions in addition to a gentle creation to Java. It makes use of a concise sort and comprises pseudocode and routines all through in order that scholars the best way to write code, instead of simply learn it. The publication covers the entire major components taught in CS2 classes, together with arrays, lists, stacks, queues, recursion, maps, and timber

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You may assume the array is nonempty. Test your implementation in main(). 12. Write a display(int[] data) method for the ArrayFunctions class that prints the contents of the given array on one line. Use print() for each element, but finish with a final println() so that future output appears on its own line. Test your implementation in main(). 4 Using Objects Java is an object-oriented programming language, and so, learning to use objects is one of the keys to successfully adapting to the language.

4. 4: String Methods char charAt(int i) Character at position i. int indexOf(String s) Index of first occurrence of s in this string, −1 if not found. int indexOf(String s, int start) Index of first occurrence of s in this string starting at index start, −1 if not found. int length() Number of characters in string. String substring(int i) Substring starting at index i. String substring(int i, int j) Substring from index i to j - 1. String toLowerCase() Returns copy in all lowercase. String toUpperCase() Returns copy in all uppercase.

Accessing a field or method of a reference variable using a dot is sometimes called dereferencing the variable. Only variables declared with reference types can be dereferenced. If you try to dereference a variable declared with a primitive type, you well get an error. Object References Recall that reference types point to the object they refer to using a reference, rather than directly storing data like primitives. Given these assignments: int x = 17; String s = "This is a string"; it is helpful to imagine the difference like this: x: s: 17 "This is a string" because the actual contents of s are a reference to the string object.

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